What the manual says
Manufacturer manualBURNER LIT
What causes this fault?
This is not a fault, but rather a status indicator showing that your boiler is working exactly as it should. It signifies that the gas burner has successfully ignited and is currently generating heat for your radiators or hot water tank. You will see this light whenever the thermostat or timer calls for heat and the startup sequence is complete.
DIY fix possible
No action is required as this is a status light showing the boiler is working correctly.Check your thermostat or programmer settings if the boiler is running when you do not want it to.Ensure your radiator valves are open if the boiler is lit but the house remains cold.
Avoid the next call-out bill
A cover plan would handle faults like NEON4: no call-out fees, no surprise bills.
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